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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b62f433f02cd0600628d2ef5324345a5e1fd0d9560ef444f5a1f9ced0d6029a3' 
  AND token = '3cfGpK73i7gHjz1fIAFs61sTH4+VOjXoFT3yzFrhxUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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