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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e8a1c4b1108ed2c6a0e9d64c6a0f5a890a933c93d6638e391d30acce1499c0f' 
  AND token = 'BMngIVRreayusz8h5h4bpR4dgk2iLeUvvGG7iog4WOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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