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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6caa4a491340bd6d4e39e7b388efd9327ff7e3cca180e2a233110030f0b33ea9' 
  AND token = 'SqwXk+F7i8sWj0yrg4Teb6o1gjD4Gg9O9g5/+ndm4vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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