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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa590e4c9efe158a34596b3708b44f27a8c6a016194ad46a3b9b6a56f7b9e0a' 
  AND token = 'TBA/VTJkzNWLa/M+TQySdews5De6UhttnB/gFnXM0aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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