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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e52ef2e11408fb16151d8a2bc7738c2b879967b994fb675d1528c622962e6691' 
  AND token = '5z25uXHZj96EvMeIBSW8eqjT0mLyjvc/2BYh8yYoyjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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