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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce934c1b5a6c5ce1e5bd0a612d97058f4bddfb43ce5c4e80290de0479aaacb7' 
  AND token = '9Hv1QDGb3mCTbQYsN8laynvWgqxUNDTKanMJ2oCVkAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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