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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92bd5968c68203e215a343d9ad575eac747bbabb64bcbf7e3f39fe91b6572681' 
  AND token = 'Saj32wArPrPRGTnxCyiS1nedIZewHRh2mbvqg/KEP3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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