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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb54b215bbdb02a160fc90e321357e7b2f1d5dfe9a30baba8d37752cbfa0f1f9' 
  AND token = '2SCq+jYisIZaczeQnRxBoQoFzHuNfEExC/PfddEEuYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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