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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72c02773988ab14f55ee296b27f2cbd9d361c632d1fe9149d7d3ef7f72dabf49' 
  AND token = 'gX59fYamd9BW3mY484QkRPKNm4F6lf3nm8g2LpWqrn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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