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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '297ff075c3c05e051504f36be8258518c68518e0c09bc14f24e65fffba86a951' 
  AND token = 'T8F11/yrvjZyzVZ6L4dwEon54i3v20aS18D3nnLm12U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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