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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea9741105c6ae81a9401b37e58fa7fd8a6fb8709c3be55c96eb204fe07c5285e' 
  AND token = 'aG6lKApt+M1VskZy97lWLC3KyC+RgIML3ICwWo49w5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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