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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbee2b7f48edb6fff77ef12ebde2a24c243dd3633bc84f74d9a72d5fa8b51973' 
  AND token = 'Ob3wAhhoQ5UbNhzDcPH7TWQcJEjGLt+Dq980sl6IeJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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