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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f84f04c43f8201971f4da41cef19795b6b23c4f5662f1253d0928c911cae2e6' 
  AND token = 'h1YJLcqGciHSTdVpT3cnHfnurRqABgY3O58i/IRDsdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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