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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc98c193b554ad2c7ea0684dd4347470d6034233c691c6a7cab022e562d2a96c' 
  AND token = 'w015RcKrO8gQv//rRKNOGcLm4E54z/M3cMZ9hgtup68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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