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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b706de3460a6e87eaab276b54956b88b9de6c37d6c7a75cb4f42b35e56a0954' 
  AND token = 'p7jzHtKqRofoCC1tYCBHAy+lneVtrTEq6zJ8Zku2Y1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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