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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b9807b8f042d0b3c711e21048973a4cb8a5e0c92f9ddf9d1c1b635f00ffb0bc' 
  AND token = 'phFraXgq2FpevVXY3Vl4ec+Txng7IXGFQwjEHeXrrt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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