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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13016c78e93de1f7ef364bb17c011c2162a66c0efb2d4d1ec1d2e5fb72d51047' 
  AND token = 'bcCCxu3yzdjL46XJL31Fi6/ywpBXCzkxoJ5RMLyt3FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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