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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40274da5cfe6c89d89f0910f54f8ec9120bfac6dce131dea8d7b9279eb8de6ce' 
  AND token = 'lVyUzVoYeF7ZnxT0W9/SGPiySQTX/x3Z8DyplidL94g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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