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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b5551d5c964b26d8a001a2eaaec12ca364989079aaba9da691cdfdb44c60b4' 
  AND token = 'uersu/RX627gojP1E35U4xWMBI0OmspvMd6tfvupX7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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