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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd9e26463abb5e68337e42dc93a8b0f70768d3ddef15a4ac4ec8ee5362c1e37' 
  AND token = 'HmlCVTqmrp0jHkumktj6XuzjUL4dasBWBh5K0ne0b8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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