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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da57537bd3cf3eaa798430b9fcdc8f2beb7b0bd9469050c14a487c8ea57eec4' 
  AND token = 'VRr6n1VeI+LSn08BEPZ7RYpmc8lZouba7MeibiVkAAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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