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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0220219c94f7e907edb9ff4d7f94e9d15573739f10e6a4f0e550cd7ec30ecbe9' 
  AND token = 'ThP+yMqwpD9ZpPCzTpLTh2IX97VDY6B/r9+jKMRc5/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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