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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d3e4eefb2319c5e2d9f5cd04ab40bc89e74849fe2b93f234ac9918084b4e005' 
  AND token = '692iCHOsqAp1uKJ1arZmp+igznJfbbHONSudv+nsiQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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