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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0116c8d51b5e33bf60604a85cac05829b23eb62f59cd4eb45a83326b38af95' 
  AND token = 'RGvCsPV9T6ZH+sUro7cHFeD/ykPDb+9cNKxB97Ga3Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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