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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d08fa01aaeeaa2f687cfba2d2909caf58d87f40012762ed27584ff2c03ec9d7' 
  AND token = 'sB5qOceHsCYPFcmv+k5RobU+nKN+ijWC+8/3yZVD4j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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