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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b06478c62e73e96ab7caea5ed18da4f6222b516829ff2bd0a49ed0db5738ec8f' 
  AND token = 'jbaVrRm5ojFA86FRoHs6jOGOrLtR9feu/PA3A4yxj/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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