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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f0e014e30e9e826bc493dd3e6d2ac53f1421ea9b283a29f926ce6dd5af99658' 
  AND token = 'qgLhUQ336POjyV1D2MGgO+nNibwyCEXtKuTZ0LVhTSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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