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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f79ddc409ed2d4a489c86f3c10075e0f6c1dfec8f50f036b0a4396862b0bb19' 
  AND token = 'A1JVCOiTUfqEgs3wy5qeEOMpInNVJ543JgZj6UYnpd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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