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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c0f6a80f619b4e1222e33505d5e931e94b29ecda2590bfac3b44c70ea00837' 
  AND token = 'Pjvmb9MYwu+QFq6M1xSnmHjii6MAderJ9+IyrN4u7ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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