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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b03880a4220ac7c7c1e857fdd1014f362478ffbddf74c5a920ea4cfdb801d9b' 
  AND token = 'YSeaQhjtpZkpBENV7IudYhTofVdNnv8GcBTRQ4Iw2qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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