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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dda406ec29d311dc2160810410ea5608139f5ea70cc994097b8f627a06f5a736' 
  AND token = 'zgeX/NTzqg+noKwIIdjBmXeEM1qNaOJrY7OL2tkOR9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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