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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '235e59441a38e4585c3c2cb7075c06ce6a0382bc77e54c22bf8e54803911ca0c' 
  AND token = 'nC67W6k00CSrCDSlIPZaEp6ZxMoyOYj3VMRX/NkTlYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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