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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1150dc07ad1dfd6e865e276cfef77a0e664af270fc2459d6874f21ac2f90e88' 
  AND token = 'iFrouyvbz2umbkpwZ0trGeFUUdcAlpA2Vdxrtfjkn3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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