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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff839feed564f663c56f6c35305cc1f97cf0e10e3459b926e185d5c5fe694665' 
  AND token = 'hV3iUNZ0pdH4OJsxfDQd98Cs1IvApBruqZZq+SB9nC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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