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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3e8a713da899b91ca6084154a3f35ddb6f7f89c2e15e1ea5316b1bd4151c99' 
  AND token = 'zMU55n5BY6HGktO4PcYyMKgyFzWHwu0G7I6JHqgR9+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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