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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f086ee589b7abd61930794ca5fceda73b7a791d3398ae147b8b3a955f9ee62f6' 
  AND token = 'hx1aagHGyaMnmM3tEvRjBg4OqVqL/QJhPpbvqrkQdLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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