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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e2ff610f2f79364289f7d78566e1165908fa2fed33cd2bfb3b72dc51eeaeafd' 
  AND token = '68utOhWeUJf4zzDReVVTO9j9xgbjgZY1YuonEqeq/Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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