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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41ec8d1d77f792f6ad89318019bfae1ede37d2a4c1dcc36d47abdd893ad8ae70' 
  AND token = 'DRF7pXuXEbsNbJs26PLDXpXcu1u4k89ta4WYnOgMeqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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