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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52a60e7e87467a05ce4ea88a4f32e1ae89499767ee7a8693577991c06d290ef0' 
  AND token = 'ndaJXsgWBzW4bH1/AkrK4N2yMbUQhAE4oNA5UoqJ1Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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