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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '851d027f94d45610b0ea026c7c1f0568b8bda201a0108dd5436c867ec6c179e0' 
  AND token = 'vKBRb1D9Hp5Ra+0ycvkEYnpezCkGC+uUEoZoSe5i76c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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