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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e9e31eda81ec7f097d96675693e9a39fee8e19d257a5be88b309c94f96c656b' 
  AND token = 'WH/TI2y8iGT32zvT7NdbUDXl7wTYO2+BIc/SzFyztXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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