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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '555df579bd05f1030d80cebe5ba2e306601d2918378c2b10f76cfc5dc247b23a' 
  AND token = '7rSsIhosKY1uzwO+h0hjOkB2cgG7gz0asDe3bJtd+IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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