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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928dc3871330f921ef441ae98cc99c15babf938a5e71ddbc85b2db6fdf8f470e' 
  AND token = 'f6/0gUSkm4RaZtPx0df0vpog7fb7ZNo6JVDw9uwkfxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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