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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dc101da4d9257c0d58fa68dc8124acfad0afbafbab5e05a892c833ec75153c2' 
  AND token = 'KFrk+CXx5Be91q7n/tzZKUAS/ds9lfLryrKdn3B/cwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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