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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7231b9a2bc3b7f1d4cdbc7d12b57c9a39b0546a4f095623c437fdb5e25ccdd04' 
  AND token = 'i2cF/TEFVjUOHomku/048sBLnErbrY5mDQ67z79h0Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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