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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f8e756746fe8495fad4b7235dfeb68fdb02d85f1e9c80c25eb2a6e5bb83ac93' 
  AND token = 'VVWsHcsTNJDcoiUSExZz5Rdpd23YvLHx4bovZskEdxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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