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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a568dd3691343e3e5b611bb68fe2f7379ca1994e1e653a77306048a068a51c24' 
  AND token = '0cb07P3hp2TY8g1d2v24IvF/1E5jZ9Qafm8RJaq1VVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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