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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '547dd6f818bf4a36db3a72a2826c088dafb26a8e67486a970666a7573bc54456' 
  AND token = 'zC0YkzVOigejdefHcm05HzyINhZnfOBVeUzVxm46K64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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