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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd06b79221e984f90b0f31b5c9d83268f85ff7a2ebe1a2173e73c1a0cbfd3fa' 
  AND token = 'HV2Ly1qvBu04LTQ1ZFfWJ8s8qmn6IGbGxu9pCjtwVEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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