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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbbf322c689cbb702ef69caf7bef63e2819a722e430ce1cc1536901f72568f10' 
  AND token = 'gVXyUzCcNP5eQ331LFPRPo/bqVlX7A1nDBN6Ov5d0wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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