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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63bb4054d49f1852b36a6e47fe0e71455688f1a8ec7585be277eee62a6f425dc' 
  AND token = 'mCr3JrqUCuASFJ+4ydlJnoXAoRj2TF7pIYN0bUACdys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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