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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45f17fffd8368999cc4e5c96374119b6a6e32d7502f562c30500fea10c1ff56b' 
  AND token = 'EdSlaNnxDmL88YVIbFAXiM+4qVc1b+xOq3ius1pYxLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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