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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7af180243f75a4d9be86a5809b6ec25e40368ac4cec0b4e0476c82ca9a457876' 
  AND token = '/3nES481nMt5z8l5XKU4EB7Qj9/2Nr5aZ7DgXC0l0Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}