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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e69f9cb0f5b1ade03ce6b0a49a3a843fe5d3a830be85846e2ea2385587a054' 
  AND token = '5fq8hdmSbeWXV6YVfwbvTGaUuwghP7wrr4Z2VywsBeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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