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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08875b0c5d859c2c3a3d009c98bb7d78e7e8ee7159989a52aee10addb560fb7a' 
  AND token = 'fKwi92HShsZ0Tyh44fcnBvbQv7bHxdyyC3slt6ApZ74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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