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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ff9a7d7947b1f54d38aabe6e30e3976e7b59ea5c9c322ad9a8496f5b441551a' 
  AND token = 'cXBPWokkmLsCCeZR5maCttpImrnPB4VvvGoN3IljutM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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