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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1e7c4488b0b4366fefbebf5df126818512179f70e18e46ac1243c039860e89' 
  AND token = '1fKcnLQu7bNeRD09fmeeVEefEtHS1QSlWRh0jJlCGCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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