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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c17ffc91991d045e1b5b3ef6008590608e37fc86b6303ad09e6806336b4a8c2' 
  AND token = 'S3jC3UbiTHkrvUfz5l4zxBCsv38BSuryLvDW6AIi2DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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