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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c36e76ea53a0dc8f092446f30a81bf35d79e20f96a6b921d66762e08733908b' 
  AND token = 'Zul8kV0ALenvXHYNepSZaRY1yRpZ17KgoeGnW9HyqQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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