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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ff51dc064a9940aaea3ad5c915ef15afc149d47e5de2b5a32e418aabc05ff2' 
  AND token = '+pVry5GFVDbvL17k/OwdfQlH8LUJX9oD3dwSQyx5gwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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