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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a1d6a176e47da72b513efaa776a4dd2b55fccadb9f1be97b0ae8cc18e198a9' 
  AND token = 'DoL1qU7Vf/EEnrJ4k6k6CeFL//JeVPUcRZgy7L+AkJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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