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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba07a88058c62e8c09ac0b8fa79f670881337768a87869cec1c21fc494a8080' 
  AND token = 'seiaMPyB6BePRVSxI0Ut+Cyvrg7uCqXU9Ukqn+sjKQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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