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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afd30a536e7464ae2c603072875908e4a32a9ef2385b2f377b84f87d19ef87fb' 
  AND token = 'dsswFEI45tCjihBCiIR6j1jJZT6nHsaJZgw+TbM+Rrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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