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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0cc9df6074132224e9d02958944f91a12f12b591d772c0f5d9ea1b3f86f22b1' 
  AND token = 'W2yYO8/wvhZEfXdnWn0pw8LumYdPwKGN6ORWgxClSO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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