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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '175fa1060ca0a1de897a9e99e673a6a0293281bec4f11d82d8a17e34c7693b89' 
  AND token = '2JDM5yGWmkH2xdwnfzeAEzsR5NgqyUIovA3gfWEU56w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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