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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc82075c6aafda5f126d60b0b618e628498000309fd941ec5f604216159e4992' 
  AND token = '9Rvl6LnZJiF7/q5YSEab2ph6IQYH8Uy2Wt0tbPhI6HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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